/ Dictionary / Index D direct-vision prism: Meaning and Definition of Find definitions for: di•rect'-vi'sion prism" Pronunciation: (di-rekt'vizh'un, dī-), [key] — Optics. Optics. See Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. direct tax direct-vision spectroscope Related Content Daily Word Quiz: immense Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language